Resistance unit



L. KEBLER.

RESISTANCE UNIT.

APPLICATION FILED FEB. I5, IIIIQ.

Patented Deu. 27, 19211.

UNITED STATES PATENT OFFICE.

LEONARD KEBLER, F BRONXVILLE, NEW YORK, ASSIGNOR T0 WARD LEONARD ELECTRIC COMPANY. A CORPORATION OF NEW YORK.

RESISTANCE UNIT.

Specification of Letters Patent.

Patented Dee. 27, 1921.

. To all whom-t may concern:

Be it known that I, LEONARD KEBLER, a citizen of the United States, residing at .Bronxville, in the county of IVestchester and State of New York, have invented certain new and useful Improvements in Resistance Units, of which the following is a specification. Y

The principal ob'ect of my invention is to provide a new an improved enameled resistance unit. Another object is to provide suitable terminals or taps for Such a unit. Another object is to provide such a unit with terminals or taps that will permit handling and use without breaking the enamel around' their roots. These and other object-s of my invention will become ap arent upon consideration ofthe specific disclosure given by way of example in the following specification and accompanying drawings. It will be 'understood that modifications may be made within the scope of the invention.

Referring to the drawings, Figure 1 is an elevation of one endvof myA improved unit before the enamel coat is applied thereto;

Fig. 2 is a longitudinal section on the line 2 2 of Fig. 3 after the enamel coat is applied and the taps have been completed;

Fig. 3is a cross section on the line 3 3 of ig. 4 i's an enlarged view of one of the completed taps;

Fig. 5 is a. section of the same on the line 5;-5 of FigA;

Fig. 6 is alperspective viewof a detail showing the manner of assembly of certain elements, and

Figs. 7 and 8 are views corresponding to Fi 3 but Showing modifications.

n the manufacture and utilization ofenameled cylindrical resistance units they always require some kind of terminals for the attachment of conductors and in many instances intermediate taps are desirable so that connections can be made to definite portions of the resistance conductor wound on 'the whole tube. Diiculty has been experienced with the terminals or taps in making them sim le and inexpensive, but at the same time serviceable and fool-proof. If the taps are flexible, it has been a matter of some diff lculty to secure them in such a way that repeated flexing will not loosen the enamel at their roots. These diiculties and others have been overcome by my invention,

Referring to the specific embodiment of 'the invention shown in the drawings, the tubular ea'rthenware base 10 has wound thereon in a helix fromend to end a suitable length of resistance conductor 11. Each tap vor terminal consists of a stranded flexible conduc- .tor 12 around which the resistance conductor is wound closely at one point 13 (Fig. 6) in the course of manufacture. A little metal plate 14 is shaped as an open V and slipped over the Joint 13 and then pinched tightly together to secure the parts in the desired relation. The tap conductor 12 is knotted at 15 so as to form a loop 16. The end ortions of the tap conductor 12 extending om the knot 15 are drawn tightly around the tube 10 and the extremities twisted together at 19. Each terminal or tap is same Way and after the parts have been assembled as shown in Fig. 1, a coat of insulatingcnamel 2() is applied as shown in Fig. 2, which not only insulates the resistance conductor 11,-but also holds the parts rigidly in the proper relation.

In applying the enamel 20, it may be most convenient Ato apply it to all the exposed parts so that upon the complet-ion of the enameling process, the taps and. terminals 16 will all be coated with enamel. This coating of enamel on the terminals or taps 16 can all be broken off very quickly by flexing them as by means of the operator.- The branches of the loop 16 being anchored together at 15, the f lexure described will not extend beyond the point 15 and will not disturb the enamel coat 20. After the ena-mel has been removed from the loops, eyelets 17 are ut in the extremities and secured by twisting the sides of each loop together to draw the loop tight around the eyelets.l Also the edges of the eyelets may be bent around the lead so as to hold the eyelet in place without twisting, or both means may be employed concurrently to secure the eyelets in the loops. The washer 18 may be securedwith the eyelet 17 or as a part of it and on this any desired characters may be stamped as shown for example in Fig. 4 where 125-0 means 125 ohms resistance. v v

The eyelets 17 may be soldered in the surrounding stranded conductor 16 and they affordconvenient rugged attaching means for conductors that are to be led away from the taps or terminals. In the process of attachapplied in the of the thumb and lingers4 in such conductors to the eyelets 17, and ot erwise in use, the taps 16 may be flexed repeatedly, but this will not loosen the enamel coat 20 on account of the anchoring at the point 15 already described..Y

In Fig. 7 the sides of the loop 16 are secured to ether by being wrapped around with Wire 15 and in Fig. 8 the anchoring is effected by pinching a flat band 15 around the two sides of the loop.

In the following claims I use the term tap as applying whether the tap is terminal or intermediate, and the term enamel is intended to cover Vany other equivalent coating.

1. In combination, a cylindrical base of insulating material, a resistance conductor wrapped thereon, a stranded tap conductor around the said base connected with said resistance conductor and having a branch loop extended therefrom, means to fasten the parts of said tap conductor securely together at thepoint from which they extend each way around the base at the root of said branch, an eyelet fastened .in the extremity of said loop, and a coat of enamel on the base covering said conductors but leavin said branch part extending therethrou 2. n combination, a base of insulating material ay resistance conductor thereon, a flexible loop tap conductor connected with said resistance conductor, a coat of enamel over the resistance conductor and adhering to the base and leaving the tap conductor projecting therethrough, and means at the root of said tap securing the branches of the loop together.

3. In combination, a base of insulating materiah a resistance ,conductor thereon, a

flexible loop tap conductor connected with said resista-nce conductor, a coat of enamel over the resistance conductor and adhering to the base and leaving the tap conductor projecting therethrough, and an eyelet fas tened in said loop.

4. In combination, a-base of insulating .materiaL a resistance conductor thereon, av flexible tap conductor connected with sald resistance conductor, a coat of enamel overV the resistance conductor andadhering to the base and leaving the tap conductor projecting therethrough, and means to receive and display infomation signs attached to said 5. material, a resistance conductor thereon, a flexible loop tap conductor connected with said resistance conductor, a coat of enamel over the resistance conductor and. adhering to the base and leaving the ta projectmg therethrough, an eye et fastened therefrom.'v

conductor 4 over the resistance conductor and adhering to the base and leaving the tap conductor projecting therethrough, means at the root of?l said tap securing the branches of the loop together, an eyelet fastened in said loop, and a flange carried by said eyelet on which information signs may be made."

7. In combination, a cylindrical base of insulating material, a resistance conductor wrapped thereon, a tap conductor around the said base connected with said resistance conductor-and having a branch loop extended therefrom, and an eyelet soldered into the extremity of said loop with the sides of the loop twisted together and drawn tightlly around the eyelet.

8. n combination, a cylindrical base of insulating material, a resistance conductor and a coat of enamel on the base covering said conductors and the knot but leaving the branch part extending therethrough.

9. The method which consists in wrapping a resistance conductor on a cylindrical base, putting atap conductor around said base and connecting it with said resistance conductor, projecting a loop branch portion from said tap conductor at a point adjacent to said base, anchoring said loop branch at said point, enameling the whole, and lexin the branch portion to. remove the ename 10. The method vwhich consists in wrapping a'resistance conductor on a cylindrical ase, putting a tap conductor around said base and connecting it with said resistance conductor, projecting a loop branch portion from said tap conductor at a point adjacent to said base, anchoring the two sides of the loop at said point and coverin the said conductors with a coat of ename 11. The method which consists in wrap;

ping a'resistance conductor on a cylindrical base, putting a tap conductor around said Y base and connecting it with `said resistance In combination, a` hase of insulating4 LEONARD KEBLER, 

